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  • 1
    Publication Date: 2019-06-27
    Description: A substructuring technique, originally developed for the efficient reanalysis of structures, is incorporated into the methodology associated with the plastic analysis of structures. An existing finite-element computer program that accounts for elastic-plastic material behavior under cyclic loading was modified to account for changing kinematic constraint conditions - crack growth and intermittent contact of crack surfaces in two dimensional regions. Application of the analysis is presented for a problem of a centercrack panel to demonstrate the efficiency and accuracy of the technique.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-132458 , RE-480
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  • 2
    Publication Date: 2019-06-27
    Description: The PLANS system is described which is a finite element program for nonlinear analysis. The system represents a collection of special purpose computer programs each associated with a distinct physical problem class. Modules of PLANS specifically referenced and described in detail include: (1) REVBY, for the plastic analysis of bodies of revolution; (2) OUT-OF-PLANE, for the plastic analysis of 3-D built-up structures where membrane effects are predominant; (3) BEND, for the plastic analysis of built-up structures where bending and membrane effects are significant; (4) HEX, for the 3-D elastic-plastic analysis of general solids; and (5) OUT-OF-PLANE-MG, for material and geometrically nonlinear analysis of built-up structures. The SATELLITE program for data debugging and plotting of input geometries is also described. The theoretical foundations upon which the analysis is based are presented. Discussed are the form of the governing equations, the methods of solution, plasticity theories available, a general system description and flow of the programs, and the elements available for use.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2568 , RE-501-VOL-1
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  • 3
    Publication Date: 2019-06-27
    Description: The development of nonlinear analysis techniques within the framework of the finite-element method is reported. Although the emphasis is concerned with those nonlinearities associated with material behavior, a general treatment of geometric nonlinearity, alone or in combination with plasticity is included, and applications presented for a class of problems categorized as axisymmetric shells of revolution. The scope of the nonlinear analysis capabilities includes: (1) a membrane stress analysis, (2) bending and membrane stress analysis, (3) analysis of thick and thin axisymmetric bodies of revolution, (4) a general three dimensional analysis, and (5) analysis of laminated composites. Applications of the methods are made to a number of sample structures. Correlation with available analytic or experimental data range from good to excellent.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2351 , RE-454
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  • 4
    Publication Date: 2019-07-13
    Description: Electron bombardment produced clustered displacements, paired vacancies and interstitial atoms in Si, discussing possible mechanism for developing defects
    Keywords: STRUCTURAL MECHANICS
    Type: ; ADEMIE DES SCIENCES|AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, AND AMERICAN SOCIETY OF MECHANICAL ENGINEERS, STRUCTURES, STRUCTURAL DYNAMICS AND MATERIALS CONFERENCE, 8TH; Mar 29, 1967 - Mar 31, 1967; PALM SPRINGS, CA
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  • 5
    Publication Date: 2019-07-13
    Description: Plates elastic-plastic behavior under combined stretching and bending by finite element method
    Keywords: STRUCTURAL MECHANICS
    Type: STRUCTURES, AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS AND AMERICAN SOCIETY OF MECHANICAL ENGINEERS, STRUCTURES, STRUCTURAL DYNAMICS, AND MATERIALS CONFERENCE, 11TH; Apr 22, 1970 - Apr 24, 1970; DENVER, CO
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  • 6
    Publication Date: 2019-06-27
    Description: Finite element analysis of structures in plastic range
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-1649
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  • 7
    Publication Date: 2019-06-27
    Description: Discrete element method for plastic analysis of complex built-up structures subjected to cyclic loading causing membrane stress and stress reversal
    Keywords: STRUCTURAL MECHANICS
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  • 8
    Publication Date: 2019-06-27
    Description: A large deflection elastic-plastic analysis is presented applicable to orthotropic axisymmetric plates and shells of revolution subjected to monotonic and cyclic loading conditions. The analysis is based on the finite-element method. It employs a new higher order, fully compatible, doubly curved orthotropic shell-of-revolution element using cubic Hermitian expansions for both meridional and normal displacements. Both perfectly plastic and strain hardening behavior are considered. Strain hardening is incorporated through use of the Prager-Ziegler kinematic hardening theory, which predicts an ideal Bauschinger effect. Numerous sample problems involving monotonic and cyclic loading conditions are analyzed.
    Keywords: STRUCTURAL MECHANICS
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  • 9
    Publication Date: 2019-06-27
    Description: The PLANS system, rather than being one comprehensive computer program, is a collection of finite element programs used for the nonlinear analysis of structures. This collection of programs evolved and is based on the organizational philosophy in which classes of analyses are treated individually based on the physical problem class to be analyzed. Each of the independent finite element computer programs of PLANS, with an associated element library, can be individually loaded and used to solve the problem class of interest. A number of programs have been developed for material nonlinear behavior alone and for combined geometric and material nonlinear behavior. The usage, capabilities, and element libraries of the current programs include: (1) plastic analysis of built-up structures where bending and membrane effects are significant, (2) three dimensional elastic-plastic analysis, (3) plastic analysis of bodies of revolution, and (4) material and geometric nonlinear analysis of built-up structures.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-145244
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  • 10
    Publication Date: 2019-07-13
    Description: Finite element method for plastic bending analysis of structures
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-97373 , RE-347-J , AF 2D CONF. ON MATRIX METHODS IN STRUCTURAL MECH.; Oct 15, 1968 - Oct 17, 1968; WRIGHT-PATTERSON AFB, OH; UNITED STATES
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